#include"Day.h"

void Date::dayprint()
{
	cout << _year << "/" << _month << "/" << _day << endl;
}

int Date::GetMonthDay(int year, int month)
{
	assert(_month <= 12 &&_month>=1);
	static int arr[13] = { -1,31,28,31,30,31,30,31,31,30,31,30,31};
	if (month == 2 && (year % 4 == 0 && year % 100 != 0 ) || (year % 400 == 0))
	{
		return 29;
	}
	return arr[month];
}
Date::Date(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}

Date& Date::operator=(const Date& d)
{
	this->_year = d._year;
	this->_month = d._month;
	this->_day = d._day;
	return *this;
}
Date::~Date()
{
	_year = _month = _day = 0;
}
Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}	
	}
	return *this;
}

Date Date::operator+(int day)
{
	Date tmp(*this);
	tmp += day;
	return tmp;
}

Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		_day += GetMonthDay(_year, _month);
		_month--;
		if (_month == 0)
		{
			_month = 12;
			_year--;
		}
	}
	return *this;
}

Date Date::operator-(int day)
{
	Date tmp(*this);
	tmp -= day;
	return tmp;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp;
}

Date Date::operator--(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}


bool Date::operator>(const Date& d)
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year)
	{
		if (_month > d._month)
		{
			return true;
		}
		else if (_month == d._month)
		{
			return _day > d._day;
		}
	}
	return false;
}

bool Date::operator==(const Date& d)
{
	return _year == d._year && _month == d._month && _day == d._day;
}

bool Date::operator >= (const Date& d)
{
	return *this > d || *this == d;
}

bool Date::operator < (const Date& d)
{
	return !(*this >= d);
}

bool Date::operator <= (const Date& d)
{
	return *this < d || *this == d;
}

bool Date::operator != (const Date& d)
{
	return !(*this == d);
}

int Date::operator-(const Date& d)const
{
	Date max(*this);
	Date min(d);
	int flag = 1;
	if (max < min)
	{
		Date tmp = max;
		max = min;
		min = tmp;
		flag = -1;
	}
	int n = 0;
	while (min != max)
	{
		min++;
		n++;
	}
	return n * flag;
}